24. Let A = determine: (9 -16) 12 -15 (-8 12) and B = , -16 4 (a) 23 A - 34 B 25. If P =(16 -8 )and Q =(-8 12), find 12 -15 (a) 34 P + 27 Q (b) 14 P + 37 Q (b) 53 A + 12 B -16 4 254